U.S. patent application number 13/141548 was filed with the patent office on 2011-10-27 for speaker unit, manufacturing method thereof, and portable information terminal.
This patent application is currently assigned to SANYO ELECTRIC CO., LTD.. Invention is credited to Yuki Hatanaka, Kazuyuki Kosuda.
Application Number | 20110261990 13/141548 |
Document ID | / |
Family ID | 42287459 |
Filed Date | 2011-10-27 |
United States Patent
Application |
20110261990 |
Kind Code |
A1 |
Kosuda; Kazuyuki ; et
al. |
October 27, 2011 |
SPEAKER UNIT, MANUFACTURING METHOD THEREOF, AND PORTABLE
INFORMATION TERMINAL
Abstract
A frame includes terminals. A diaphragm is supported by a frame
so as to vibrate in one direction. A magnet is fixed to frame. A
voice coil includes a winding portion and wire portions. Winding
portion is fixed to diaphragm so as to receive a magnetic field
from magnet. Wire portions and serve to electrically connect wiring
portion and terminals, respectively. Wire portions have bending
portions bent in one direction from winding portion towards
terminals.
Inventors: |
Kosuda; Kazuyuki; (Osaka,
JP) ; Hatanaka; Yuki; (Hyogo, JP) |
Assignee: |
SANYO ELECTRIC CO., LTD.
Moriguchi-shi, Osaka
JP
|
Family ID: |
42287459 |
Appl. No.: |
13/141548 |
Filed: |
November 11, 2009 |
PCT Filed: |
November 11, 2009 |
PCT NO: |
PCT/JP2009/069158 |
371 Date: |
June 22, 2011 |
Current U.S.
Class: |
381/398 ;
29/594 |
Current CPC
Class: |
H04R 1/06 20130101; H04R
2499/11 20130101; H04R 9/045 20130101; H04R 31/00 20130101; Y10T
29/49005 20150115 |
Class at
Publication: |
381/398 ;
29/594 |
International
Class: |
H04R 1/00 20060101
H04R001/00; H04R 31/00 20060101 H04R031/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 22, 2008 |
JP |
2008-326180 |
Claims
1. A speaker unit comprising: a frame including a terminal, a
diaphragm supported by said frame so as to vibrate in one
direction, a magnet fixed to said frame, and a voice coil including
a winding portion fixed to said diaphragm to receive a magnetic
field from said magnet, and a wire portion which electrically
connects said winding portion and said terminal, said wire portion
having a bending portion bent in said one direction from said
winding portion towards said terminal.
2. The speaker unit according to claim 1, wherein said winding
portion is wound to take a polygonal shape in plan view.
3. A portable information terminal comprising the speaker unit
defined in claim 1.
4. A method of manufacturing a speaker unit which includes a frame
including a terminal, a diaphragm supported by said frame so as to
vibrate in one direction, a magnet fixed to said frame, and a voice
coil including a winding portion fixed to said diaphragm to receive
a magnetic field from said magnet, and a wire portion which
electrically connects said winding portion and said terminal, said
method comprising the steps of: arranging said wire portion spaced
apart from said terminal, and traversing over said terminal in plan
view, and bending said wire portion at a region in contact with a
shaping member and connecting said wire portion to said terminal by
pressing said wire portion against said terminal in a state where
said shaping member is located between said frame and said wire
portion.
5. The method of manufacturing a speaker unit according to claim 4,
wherein said winding portion is wound to take a polygonal shape in
plan view.
Description
TECHNICAL FIELD
[0001] The present invention relates to a speaker unit, a method of
manufacturing a speaker unit, and a portable information terminal.
Particularly, the present invention relates to a speaker unit
including a voice coil, a method of manufacturing a speaker unit,
and a portable information terminal.
BACKGROUND ART
[0002] Some speaker units employ voice coils. According to Japanese
Patent Laying-Open No. 2002-354583, for example, a speaker includes
a frame, a diaphragm, a voice coil, and a pair of terminal members.
The frame supports the peripheral rim region of the diaphragm from
the bottom side. The voice coil is fixed to the bottom of the
diaphragm. A pair of lead wires extending from the voice coil is
conductively fixed to the pair of terminal members attached to the
frame. [0003] Patent Document 1: Japanese Patent Laying-Open No.
2002-354583
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0004] In recent years, the field of portable information terminals
such as a DSC (Digital Still Camera), PDA (Personal Digital
Assistants), and PC (Personal Computer) is moving towards reducing
the size, thickness, and weight of the terminal. The space for
mounting a speaker unit in a portable information terminal is
further restricted. Particularly, the space between the frame and
diaphragm has become smaller. The wire portion to connect the
winding portion of the voice coil and the frame terminal must pass
through this restricted space. Therefore, the wire portion
connecting the winding portion and the terminal linearly, as in the
approach of aforementioned publication, causes a problem in the
displacement of the voice coil. Specifically, when the voice coil
is displaced towards the diaphragm, the wire portion may be pulled
excessively to be disconnected. When the voice coil is displaced in
an opposite direction, there is a problem that the wire portion may
collide against the frame or another member attached to the frame
such as the yoke.
[0005] The present invention is directed to the problems set forth
above. An object of the present invention is to provide a speaker
unit that can prevent the wire portion from being disconnected or
colliding against another member, a method of manufacturing a
speaker unit, and a portable information terminal.
Means for Solving the Problems
[0006] A speaker unit of the present invention includes a frame, a
diaphragm, a magnet, and a voice coil. The frame includes a
terminal. The diaphragm is supported by the frame so as to vibrate
in one direction. The magnet is fixed to the frame. The voice coil
includes a winding portion and a wire portion. The winding portion
is fixed to the diaphragm so as to receive a magnetic field from
the magnet. The wire portion serves to electrically connect the
winding portion and the terminal. The wire portion has a bending
portion bent in one direction from the winding portion towards the
terminal.
[0007] According to the speaker unit of the present invention, the
wire portion has a bending portion bent in one direction from the
winding portion towards the terminal. Since the tension of the wire
portion can be alleviated by the stretch of the bending portion,
disconnection of the wire portion can be prevented. The wire
portion allows the distance from the frame to be further ensured at
the region from the winding portion to the bending portion, as
compared to the case where the wire portion extends linearly.
Therefore, the wire portion can be prevented from colliding against
the frame or another member attached to the frame.
[0008] In the speaker unit of the present invention, the winding
portion is preferably wound to take a polygonal shape in plan view.
By immobilizing the corner of the winding portion, deviation in
position caused by rotation of the winding portion can be
prevented.
[0009] The portable information terminal of the present invention
includes the speaker unit set forth above. Accordingly, the
mounting space for the speaker unit can be reduced while preventing
disconnection and/or collision of the wire portion. Thus, a
portable information terminal can be further reduced in size,
thickness, or weight.
[0010] A method of manufacturing a speaker unit of the present
invention is directed to a speaker unit including a frame, a
diaphragm, a magnet, and a voice coil. The frame includes a
terminal. The diaphragm is supported by the frame so as to vibrate
in one direction. The magnet is fixed to the frame. The voice coil
includes a winding portion and a wire portion. The winding portion
is fixed to the diaphragm so as to receive a magnetic field from
the magnet. The wire portion serves to electrically connect the
winding portion and the terminal. The wire portion has a bending
portion bent in one direction from the winding portion towards the
terminal. A method of manufacturing a speaker unit of the present
invention includes the following steps.
[0011] The wire portion is arranged spaced apart from the terminal,
and so as to traverse over the terminal in plan view. By pressing
the wire portion against the terminal in a state where a shaping
member is located between the frame and wire portion, the wire
portion is bent at the region in contact with the shaping member
and connected to the terminal.
[0012] By the wire portion being bent at the region in contact with
the shaping member according to the method of manufacturing a
speaker unit of the present invention, a bending portion can be
formed at the wire portion. Formation of this bending portion can
be carried out simultaneous to connecting the wire portion to the
terminal.
[0013] In the method of manufacturing a speaker unit of the present
invention, the winding portion is preferably wound to take a
polygonal shape in plan view. Thus, by immobilizing the corner of
the winding portion, deviation in position caused by rotation of
the winding portion can be prevented.
Effects of the Invention
[0014] According to the speaker unit, the manufacturing method
thereof, and the portable information terminal of the present
invention set forth above, disconnection and/or collision of the
wire portion with another member can be prevented.
BEST MODE FOR CARRYING OUT THE INVENTION
[0015] Embodiments of the present invention will be described
hereinafter with reference to the drawings.
First Embodiment
[0016] FIG. 1 is a schematic plan view of a configuration of a
speaker unit according to a first embodiment of the present
invention. FIG. 2 is a schematic sectional view taken along line
II-II of FIG. 1. FIG. 3 is a schematic enlarged view in the
vicinity of arrow III in FIG. 2.
[0017] Referring to FIGS. 1-3, a speaker unit 81 of the present
embodiment includes a frame 31, a diaphragm 32, a magnet 33, a pole
piece 41, a yoke 42, and a voice coil 50.
[0018] Frame 31 includes a pair of terminals 61 and 62. Diaphragm
32 is supported by frame 31 so as to vibrate in the vibrating
direction DR (one direction). Each of terminals 61 and 62 has a
surface for a wire portion to be connected. This surface is
perpendicular to vibrating direction DR.
[0019] Magnet 33 is arranged on yoke 42. Yoke 42 is attached to
frame 31. By this configuration, magnet 33 is fixed to frame 31 via
yoke 42. Pole piece 41 is arranged above magnet 33, apart from yoke
42. By this configuration, the magnetic field from magnet 33 is
guided to pass between pole piece 41 and yoke 42.
[0020] Voice coil 50 includes a winding portion 55, and a pair of
wire portions 51 and 52.
[0021] Winding portion 55 is fixed to diaphragm 32 so as to receive
the magnetic field from magnet 33 between pole piece 41 and yoke
42. The face of diaphragm 32 where winding portion 55 is attached
is substantially perpendicular to the vibrating direction DR (FIG.
1). Winding portion 55 is formed of a wire wound around an axis in
the vibrating direction DR, and can be driven in the vibrating
direction DR (FIG. 1) by the Lorentz force. In plan view (FIG. 1),
winding portion 55 is wound to take a polygonal shape such as a
hexagon.
[0022] Wire portions 51 and 52 serve to electrically connect
terminals 61 and 62, respectively, with winding portion 55. Wire
portions 51 and 52 are attached to terminals 61 and 62,
respectively, by compression at a compression portion CP. Each of
wire portions 51 and 52 has a bending portion BD bent in the
vibrating direction DR, from winding portion 55 towards terminals
61 and 62, respectively, as shown in FIG. 3. Wire portions 51 and
52 extend substantially parallel to the surface where terminals 61
and 62, respectively, of frame 31 are arranged, at the region
between bending portion BD and winding portion 55, as shown in FIG.
3. Wire portions 51 and 52 are led out from one end and the other
end of one side of the polygon of winding portion 55 in the plan
view shown in FIG. 1.
[0023] A method of mounting voice coil 50 in a method of
manufacturing speaker unit 81 set forth above will be described
hereinafter. FIGS. 4-6 are schematic perspective views of the first
to third steps, respectively, in the method of mounting a voice
coil in the method of manufacturing a speaker unit according to the
first embodiment of the present invention. For a better view in
FIGS. 4-6, the shape of frame 31 is simplified.
[0024] Referring to FIG. 4, frame 31 including terminals 61 and 62
is inserted in a jig (not shown). Then, shaping pins (shaping
members) 71 and 72 are inserted from the side corresponding to the
jig in a direction indicated by the open arrow in FIG. 4.
Accordingly, between terminals 61 and 62 on frame 31, shaping pins
71 and 72 are arranged in the proximity of terminals 61 and 62,
respectively, so as to extend parallel to the surface of frame
31.
[0025] Referring to FIG. 5, voice coil 50 is inserted into the
aforementioned jig. During this insertion, wire portions 51 and 52
are arranged apart from terminals 61 and 62, respectively, and
traversing above terminals 61 and 62 in plan view. Shaping pins 71
and 72 are set at a state located between respective wire portions
51,52 and frame 31.
[0026] Referring to FIG. 6, wire portions 51 and 52 are pressed
against respective terminals 61 and 62 by compression pins 73 and
74, respectively, in a state where shaping pins 71 and 72 are
located between respective wire portions 51,52 and frame 31.
Accordingly, wire portions 51 and 52 are bent at the region in
contact with shaping pins 71 and 72, and connected to terminals 61
and 62, respectively, by compression. In other words, each of wire
portions 51 and 52 has a bending portion BD and a compression
portion CP formed at the same time. Accordingly, wire portions 51
and 52 are shaped to have a bending portion BD, and extend
substantially parallel to the surface where terminals 61 and 62,
respectively, of frame 31 are arranged, at the region between
bending portion BD and winding portion 55.
[0027] Then, any unnecessary portion of wire portions 51 and 52 is
removed. Moreover, a protection adhesive is applied to compression
portion CP, as necessary. Then, shaping pins 71 and 72 are
removed.
[0028] Thus, voice coil 50 is mounted as set forth above.
[0029] The functional effect of speaker unit 81 of the present
embodiment will be described hereinafter, relative to a comparative
example.
[0030] By including a bending portion BD as shown in FIG. 3 in
speaker unit 81 of the present embodiment, the event of wire
portions 51 and 52 being disconnected or colliding with another
member at the time of operation can be suppressed. This will be
described hereinafter relative to a comparative example.
[0031] FIG. 7 is a schematic partial sectional view of a
configuration of a speaker unit according to a first comparative
example. FIG. 8 is a schematic partial sectional view of the voice
coil of FIG. 7 in a manner displaced towards the diaphragm. FIG. 9
is a schematic partial sectional view of the voice coil of FIG. 7
displaced in a direction opposite to the diaphragm side.
[0032] Referring mainly to FIG. 7, a speaker unit 81S of the first
comparative example includes a wire portion 51S extending linearly
from winding portion 55 towards terminal 61, absent of a bending
portion BD (FIG. 3). Such a shape of wire portion 51S is
disadvantageous in that wire portion 51S will be excessively
stretched so as to be disconnected when diaphragm 32 is displaced
upwards, as shown in FIG. 8 (the direction indicated by the open
arrow). Further, when diaphragm 32 is displaced downwards (the
direction indicated by the open arrow), as shown in FIG. 9, wire
portion 51S will readily collide against a corner CN of yoke 42
attached to frame 31.
[0033] In the present embodiment, wire portions 51 and 52 have
bending portions BD bent in the vibrating direction DR from winding
portion 55 to terminals 61 and 62, respectively, as shown in FIG.
2. Accordingly, the tension of each of wire portions 51 and 52 can
be alleviated by the stretching of bending portion BD, as shown in
FIG. 15, allowing disconnection of wire portions 51 and 52 (not
shown in FIG. 15) to be prevented.
[0034] Moreover, wire portions 51 and 52 allow a greater distance
from frame 31 to be ensured at the region from winding portion 55
to bending portion BD, as compared to the case where the wire
portion extends linearly (FIG. 7). Thus, the wire portion can be
prevented from colliding against the frame or another member
attached to the frame, as shown in FIG. 16.
[0035] According to speaker unit 81 of the present embodiment,
winding portion 55 of voice coil 50 takes a polygonal shape in plan
view. Therefore, the lateral symmetry of voice coil 50 in plan view
can be maintained readily. This will be described hereinafter
relative to a comparative example.
[0036] FIG. 10 is a schematic plan view of a configuration of a
speaker unit in a second comparative example. Referring to FIG. 10,
a speaker unit 81R of the second comparative example includes a
winding portion 55R of a voice coil 50R. Winding portion 55R takes
a circle form in planar shape. Since such a winding portion 55R
taking a circular shape allows voice coil 50R to easily rotate
relative to diaphragm 32, as shown in FIG. 13, when voice coil 50R
is to be fixed to diaphragm 32, the leading end of wire portions
51R and 52R from winding portion 55R cannot be defined. Therefore,
the lateral symmetry of the shape of voice coil 50R in plan view
cannot be achieved. In this case, not only the symmetry of wire
portions 51R and 52R in plan view, but also the horizontal property
of wire portions 51R and 52R is disturbed, as shown in FIG. 14. As
a result, the acoustic property of speaker unit 81R may be
adversely affected.
[0037] In the present first embodiment, winding portion 55 (FIG. 1)
is wound to take a polygonal shape in plan view. By immobilizing
the corner of winding portion 55, deviation in position caused by
rotation of winding portion 55 can be prevented.
[0038] According to the method of manufacturing speaker unit 81 of
the present embodiment, the steps are simplified by forming bending
portion BD and compression portion CP at the same time, as shown in
FIG. 6. Further, since bending portion BD is bent in the vibrating
direction DR, the symmetry of voice coil 50 can be easily
maintained. This will be described hereinafter relative to a
comparative example.
[0039] FIGS. 11 and 12 are schematic perspective views of the first
and second steps, respectively, of a method of mounting a voice
coil in the method of manufacturing a speaker unit according to a
second comparative example.
[0040] Referring to FIG. 11, shaping pins 71N and 72N are arranged
in proximity to terminals 61 and 62, respectively, so as to extend
perpendicular to the surface of frame 31. Then, voice coil 50R is
disposed.
[0041] As indicated by the open arrow in FIG. 11, wire portions 51R
and 52R are wound to run along a portion of the outer circumference
of shaping pins 71N and 72N, respectively. Accordingly, a bending
portion BN is formed at each of wire portions 51R and 52R.
[0042] Referring to FIG. 12, compression portion CP is formed by
pressing wire portions 51R and 52R against terminals 61 and 62 by
compression pins 73 and 74, respectively.
[0043] In the present comparative example, the process is
cumbersome since the step of forming bending portion BN (FIG. 11)
and the step of forming compression portion CP (FIG. 12) are
carried separately.
[0044] Moreover, since bending portion BN of voice coil 50R (FIG.
10) is bent in a direction perpendicular to the vibrating direction
of diaphragm 32 (in-plane direction in FIG. 10), the spring force
of bending portion BN may act (spring back) in a direction
perpendicular to the vibrating direction (in-plane direction in
FIG. 10). This action may induce deviation in position (FIG. 13)
caused by rotation, or disturb the symmetry of voice coil 50R in
plan view.
[0045] In the present embodiment, a bending portion BD can be
formed at each of wire portions 51 and 52, by wire portions 51 and
52 being bent at the region in contact with shaping pins 71 and 72,
respectively. Moreover, the formation of this bending portion BD
may be carried out simultaneous to the connection of wire portions
51 and 52 to terminals 61 and 62, respectively, by compression
portion CP. Therefore, the process can be simplified as compared to
the case where bending portion BN and compression portion CP are
formed in different steps, as shown in FIGS. 11 and 12.
[0046] Since bending portion BD is bent in the vibrating direction
DR (FIG. 2), the spring force of bending portion BD will not act in
the direction perpendicular to the vibrating direction DR (FIG. 2)
of bending portion BD (in-plane direction in FIG. 10), differing
from bending portion BN bent perpendicular to the vibrating
direction (FIG. 10). Thus, the event of the symmetry of voice coil
50 in plan view being disturbed by the action of the spring force
can be avoided.
[0047] Although the present embodiment has been described based on
a diaphragm 32 (FIG. 1) having an elliptical shape in plan view,
the present invention is not limited thereto. For example, a
configuration in which a diaphragm 32a having a track type shape is
mounted to frame 31a, as shown in FIG. 17, or a configuration in
which a diaphragm 32b having a circular shape is mounted to frame
31b, as shown in FIG. 18, may be employed.
[0048] Although a winding portion 55 (FIG. 1) having a regular
polygonal shape (FIG. 1) in plan view has been described in the
present embodiment, the present invention is not limited thereto.
For example, a winding portion 55W having a hexagonal shape
lengthened in one direction (horizontal direction in the drawing),
as shown in FIG. 19, may be employed.
Second Embodiment
[0049] FIG. 20 is a schematic plan view of a configuration of a
speaker unit according to a second embodiment of the present
invention. FIG. 21 is a schematic partial side view of a
configuration of a voice coil at a point in view in the direction
of the open arrow in FIG. 20.
[0050] Referring to FIGS. 20 and 21, a speaker unit 81v of the
present embodiment includes a voice coil 50v, instead of a voice
coil 50 of the first embodiment. Voice coil 50v includes wire
portions 51v and 52v. Each of wire portions 51v and 52v is led out
from one vertex of the polygon of winding portion 55. The lead out
of wire portions 51v and 52v from winding portion 55 is effected in
the forward direction with respect to the winding direction such
that the line between each of wire portions 51v and 52v and winding
portion 55 is not bent acutely.
[0051] A method of mounting voice coil 50v in the method of
manufacturing speaker unit 81v will be described hereinafter. FIG.
22 is a schematic perspective view of a step in a method of
mounting a voice coil in the method of manufacturing a speaker unit
in the second embodiment of the present invention. For a better
view, the shape of frame 31 is simplified in FIG. 22.
[0052] Referring to FIG. 22, a frame 31 including terminals 61 and
62 is inserted into a jig (not shown). Then, a shaping pin (shaping
member) 70 is inserted from the side corresponding to this jig.
Accordingly, shaping pin 70 is arranged in the proximity of
terminals 61 and 62 so as to extend parallel to the surface of
frame 31, passing through one side of the pair of terminals 61 and
62 on frame 31 (right side in the drawing).
[0053] Then, voice coil 50v is inserted into the jig set forth
above. Winding portion 55 is arranged such that shaping pin 70 is
located between the pair of terminals 61 and 62 and winding portion
55 in plan view. Wire portions 51v and 52v are arranged apart from
traverse terminals 61 and 62 and so as to traverse terminals 61 and
62, respectively, in plan view. Accordingly, shaping pin 70 attains
a state located between each of wire portions 51v and 52v and frame
31.
[0054] Wire portions 51v and 52v are pressed against terminals 61
and 62 by compression pins 73 and 74, respectively, under the state
where shaping pin 70 is located between each of wire portions 51v
and 52v and frame 31, as described above. Accordingly, wire
portions 51v and 52v are bent at the region in contact with shaping
pin 70, and connected to terminals 61 and 62, respectively, by
compression. In other words, a bending portion BD and compression
portion CP are formed at the same time at each of wire portions 51v
and 52v.
[0055] Then, any unnecessary portion of wire portions 51v and 52v
is removed. Furthermore, a protective adhesive is applied to
compression portion CP, as necessary. Then, shaping pin 70 is
removed.
[0056] Thus, voice coil 50v is mounted as set forth above.
[0057] The remaining configuration is substantially similar to that
of the first embodiment set forth above. The same or corresponding
elements have the same reference characters allotted, and
description thereof will not be repeated.
[0058] According to the present embodiment, an advantage similar to
that of the first embodiment is achieved. Furthermore, a bending
portion BD can be formed at both wire portions 51v and 52v by one
shaping pin 70.
Third Embodiment
[0059] FIG. 23 is a schematic partial perspective view of a
configuration of a portable information terminal from the operation
panel side according to a third embodiment of the present
invention. FIG. 24 is a schematic partial perspective view of a
configuration of the portable information terminal of FIG. 23 from
the backside.
[0060] Referring to FIGS. 23 and 24, a portable information
terminal of the present embodiment is a mobile phone, including an
upper case 101, a display 102, a sound emission hole 103, a hinge
104, a lower case 105, an operation button 106, a numeric button
107, a display 111, a sound emission hole 112, and a plurality of
speaker units 81 (not shown in FIGS. 23 and 24).
[0061] In the proximity of sound emission hole 103, one speaker
unit 81 is incorporated as a receiver emitting the receiving sound
or the like. In the proximity of sound emission hole 112, another
speaker unit 81 is incorporated as a speaker emitting a ring tone
or the like.
[0062] The remaining configuration is substantially identical to
that of the first embodiment set forth above. The same or
corresponding elements have the same reference characters allotted,
and description thereof will not be repeated.
[0063] The portable information terminal of the present embodiment
including speaker unit 81 allows the mounting space for speaker
unit 81 to be reduced while preventing disconnection and/or
collision of wire portions 51 and 52, as described in the first
embodiment. Therefore, the portable information terminal can be
further reduced in size, thickness, and weight.
[0064] It should be understood that the embodiments disclosed
herein are illustrative and non-restrictive in every respect. The
scope of the present invention is defined by the terms of the
claims, rather than the description of the embodiments set forth
above, and is intended to include any modifications within the
scope and meaning equivalent to the terms of the claims.
INDUSTRIAL FIELD
[0065] The present invention is advantageously applied to a speaker
unit including a voice coil, a manufacturing method thereof, and a
portable information terminal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0066] FIG. 1 is a schematic plan view of a configuration of a
speaker unit according to a first embodiment of the present
invention.
[0067] FIG. 2 is a schematic sectional view taken along line II-II
in FIG. 1.
[0068] FIG. 3 is a schematic enlarged view in the vicinity of arrow
III in FIG. 2.
[0069] FIG. 4 is a schematic perspective view of a first step in a
method of mounting a voice coil in the method of manufacturing a
speaker unit according to the first embodiment of the present
invention.
[0070] FIG. 5 is a schematic perspective view of a second step in a
method of mounting a voice coil in the method of manufacturing a
speaker unit according to the first embodiment of the present
invention.
[0071] FIG. 6 is a schematic perspective view of a third step in a
method of mounting a voice coil in the method of manufacturing a
speaker unit according to the first embodiment of the present
invention.
[0072] FIG. 7 is a schematic partial sectional view of a
configuration of a speaker unit of a first comparative example.
[0073] FIG. 8 is a schematic partial sectional view of the voice
coil of FIG. 7 in a manner displaced towards the diaphragm.
[0074] FIG. 9 is a schematic partial sectional view of the voice
coil of FIG. 7 displaced in a direction opposite to the diaphragm
side.
[0075] FIG. 10 is a schematic plan view of a configuration of a
speaker unit according to a second comparative example.
[0076] FIG. 11 is a schematic perspective view of a first step in a
method of mounting a voice coil in a method of manufacturing a
speaker unit of the second comparative example.
[0077] FIG. 12 is a schematic perspective view of a second step in
a method of mounting a voice coil in a method of manufacturing a
speaker unit of the second comparative example.
[0078] FIG. 13 is a schematic plan view of the winding portion of
the voice coil of FIG. 10 in a state where deviation in position is
caused by rotation of the winding portion.
[0079] FIG. 14 is a schematic sectional view of FIG. 13.
[0080] FIG. 15 is a schematic partial sectional view of the voice
coil of FIG. 3 displaced towards the diaphragm side.
[0081] FIG. 16 is a schematic partial sectional view of the voice
coil of FIG. 3 displaced in a direction opposite to the diaphragm
side.
[0082] FIG. 17 is a schematic plan view of a configuration of a
speaker unit according to a first modification in the first
embodiment of the present invention.
[0083] FIG. 18 is a schematic plan view of a configuration of a
speaker unit according to a second modification in the first
embodiment of the present invention.
[0084] FIG. 19 is a schematic plan view of a configuration of a
speaker unit according to a third modification in the first
embodiment of the present invention.
[0085] FIG. 20 is a schematic plan view of a configuration of a
speaker unit according to a second embodiment of the present
invention.
[0086] FIG. 21 is a schematic partial side view of a configuration
of a voice coil at a point in view in the direction of the open
arrow in FIG. 20.
[0087] FIG. 22 is a schematic perspective view of a step in a
method of mounting a voice coil in the method of manufacturing a
speaker unit in the second embodiment of the present invention.
[0088] FIG. 23 is a schematic partial perspective view of a
configuration of a portable information terminal from the operation
panel side according to a third embodiment of the present
invention.
[0089] FIG. 24 is a schematic partial perspective view of a
configuration of the portable information terminal of FIG. 23 from
the backside.
DESCRIPTION OF THE REFERENCE CHARACTERS
[0090] 31, 31a, 31b frame; 32, 32a, 32b diaphragm; 33 magnet; 41
pole piece; 42 yoke; 50, 50v voice coil; 51, 51v, 52, 52v wire
portion; 55 winding portion 55W winding portion; 61, 62 terminal;
70, 71, 72 shaping pin; 73, 74 compression pin; 81, 81v speaker
unit; BN bending portion; CP compression portion; DR vibrating
direction.
* * * * *